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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa03900004735505bece735060d375148aa6a77668496270cf2074792a9db320' 
  AND token = 'FN3sfZ4NH3Gjm5mUg/J/WAN0tmXw8Prl2ayDv5DKdT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}